Add initial version of chrome://popular-sites-internals page

chrome/browser/android/popular_sites.h

Index: chrome/browser/android/popular_sites.h
diff --git a/chrome/browser/android/popular_sites.h b/chrome/browser/android/popular_sites.h
index 635d3732220a391d2c780880a9f058bd398c6e52..f6a5b9e6c0ce8da74ecfe84d377436578704c528 100644
--- a/chrome/browser/android/popular_sites.h
+++ b/chrome/browser/android/popular_sites.h
@@ -51,11 +51,14 @@ class PopularSites {
   // override the baked-in default version.
   // |override_filename|, if non-empty, will override the full filename
   // (so |override_country| and |override_version| are ignored in this case).
+  // Set |force_download| to enfore re-downloading the suggestions file, even if
+  // it already exists on disk.
   // TODO(treib): Get rid of |override_filename|.
   PopularSites(Profile* profile,
                const std::string& override_country,
                const std::string& override_version,
                const std::string& override_filename,
+               bool force_download,
                const FinishedCallback& callback);
   ~PopularSites();